C++ PATCH for c++/49554 (bogus error with lambda in template)

[Jason Merrill]

The failure in this testcase was happening because we were trying to 
evaluate the capture decltype again when instantiating the lambda 
operator(), but it only works when we're still in the enclosing function 
context.  Fixed by basically waiting to copy the type over at 
instantiation time rather than copy the dependent type at template 
definition time.

Tested x86_64-pc-linux-gnu, applied to trunk.
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